[HungryBear]

Using the water-skier/ boat example:

Outside the arc is the skier tow-rope outside the wake of the boat.

Inside the arc is when the tow-rope crosses the wake. either because the skier never got outside before the boat turns or the boat turns so sharp that the tow-rope is inside the wake.

Because you can't push a string example ends here.

BUT, A shaft bends.

If the angle (approx) of the shaft is "inside" the arc it will stay there and if your wrists are flexible enough you can hit yourself in the back of the head with the club head (softly though)

The straight line would be a special case where the arc of the hands have an infinite radius so the club will be inside and just line up behind the force pulling it.

Just how I visualize the example.

The Bear